Laos Climate and Weather

Laos has a monsoon climate with three overlapping seasons. The rainy season is about 5 months, June-September. In October, rains start to taper off, and the cool season begins in November, lasting through February. In March "mango rains" occur. March, April, and May are hot and humid. In April, the hottest month, temperatures in Vientiane range from 72°F to 93°F, and in January, the coolest month, 52°F to 83°F. Temperature extremes of 103°F (April) and 39°F (January) have been recorded.